/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package controller_buscarIMG;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

/**
 *
 * @author Ceballos
 */
@WebServlet(name = "LeerIMG", urlPatterns = {"/LeerIMG"})
public class LeerIMG extends HttpServlet {
    @Resource(name = "recurso")
    private DataSource recurso;

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
       
        
        String studentIdStr = request.getParameter("studentId");

        int studentId = 0;
        if (studentIdStr != null && !studentIdStr.equals("")) {
            studentId = Integer.parseInt(studentIdStr);
        }
        
        String img = null;
        Connection con = null;
        try {
            con = recurso.getConnection();
            String query = "select foto from student where studentId='" + studentId + "'";
            Statement stm = con.createStatement();
            ResultSet rs = stm.executeQuery(query);
            rs.next();
            InputStream imgstream = rs.getBinaryStream("img");
            byte[] img2 = new byte[8192];
            int index = 0;
            response.setContentType("image/jpg");
            while ((index = imgstream.read(img2)) > -1) {
                response.getOutputStream().write(img2);
            }
            response.getOutputStream().flush();
            response.getOutputStream().close();
            imgstream.close();
            stm.close();
        } catch (SQLException e) {
        }
    
    
}

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
 * Handles the HTTP <code>GET</code> method.
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
@Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
        public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
